The article talks about how the German Federal Railway decides when to switch train lines to electric power. It looks at things like how much money it costs, if it helps the country's economy, and where they will get the money from. The author describes how they figure out if it's worth it to change the trains to electric power by looking at the money it will make and how much it will cost. They also discuss how changing the trains can affect the country as a whole. Lastly, they talk about how much money they need and where they will get it from to make this switch happen.